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Finding the Fourth Proportional to 1,272.53, 1,908.79 and 450.61

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Solution

The fourth proportional to 1,272.53, 1,908.79 and 450.61 is: 675.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.53 : 1,908.79 = 450.61 : x
  2. Step 2: Convert to fraction form
    1,272.53/1,908.79 = 450.61/x
  3. Step 3: Cross multiply
    1,272.53x = 1,908.79 × 450.61
  4. Step 4: Simplify right side
    1,272.53x = 860,119.86
  5. Step 5: Solve for x
    x = 860,119.86/1,272.53
  6. Step 6: Final answer
    x = 675.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.